package password;

import java.lang.reflect.Method;
import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

//import sun.misc.BASE64Decoder;
//import sun.misc.BASE64Encoder;

/**
* AES 是一种可逆加密算法，对用户的敏感信息加密处理
* 对原始数据进行AES加密后，在进行Base64编码转化；
* 正确
*/
public class AesCBC {
	
	
/*已确认
* 加密用的Key 可以用26个字母和数字组成
* 此处使用AES-128-CBC加密模式，key需要为16位。
*/
	  String abc="L+\\~f4,Ir)b$=pkf";
//    private static String sKey="zysoftware123456";
    private static String sKey="LdfbAo1S8Dggjj==";
//    private static String ivParameter="1234567890123456";
    private static String ivParameter="L+\\~f4,Ir)b$=pkf";
    private static AesCBC instance=null;
    //private static 
    private AesCBC(){

    }
    public static AesCBC getInstance(){
        if (instance==null)
            instance= new AesCBC();
        return instance;
    }
    // 加密
    public String encrypt(String sSrc, String encodingFormat, String sKey, String ivParameter) throws Exception {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        byte[] raw = sKey.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());//使用CBC模式，需要一个向量iv，可增加加密算法的强度
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes(encodingFormat));
//        return new BASE64Encoder().encode(encrypted);//此处使用BASE64做转码。
    for (int i = 0; i < encrypted.length; i++) {
		System.out.print(encrypted[i]);
	}
    System.out.println("");
        System.out.println("  ==="+new String(encrypted).toString());
        return encodeBase64(encrypted);//此处使用BASE64做转码。
}

    // 解密
    public String decrypt(String sSrc, String encodingFormat, String sKey, String ivParameter) throws Exception {
        try {
            byte[] raw = sKey.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
//            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);//先用base64解密
            byte[] encrypted1 = decodeBase64(sSrc);//先用base64解密
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original,encodingFormat);
            return originalString;
        } catch (Exception ex) {
            return null;
        }
}

    public static void main(String[] args) throws Exception {
        // 需要加密的字串
        String cSrc = "123456";
        System.out.println("加密前的字串是："+cSrc);
        // 加密
        String enString = AesCBC.getInstance().encrypt(cSrc,"utf-8",sKey,ivParameter);
        System.out.println("加密后的字串是："+ enString);
        System.out.println("1jdzWuniG6UMtoa3T6uNLA==".equals(enString));
        
        // 解密
        String DeString = AesCBC.getInstance().decrypt(enString,"utf-8",sKey,ivParameter);
        System.out.println("解密后的字串是：" + DeString);
    }
    
    /*** 
     * encode by Base64 
     */  
    public static String encodeBase64(byte[]input) throws Exception{  
        Class clazz=Class.forName("com.sun.org.apache.xerces.internal.impl.dv.util.Base64");  
        Method mainMethod= clazz.getMethod("encode", byte[].class);  
        mainMethod.setAccessible(true);  
         Object retObj=mainMethod.invoke(null, new Object[]{input});  
         return (String)retObj;  
    }  
    /*** 
     * decode by Base64 
     */  
    public static byte[] decodeBase64(String input) throws Exception{  
        Class clazz=Class.forName("com.sun.org.apache.xerces.internal.impl.dv.util.Base64");  
        Method mainMethod= clazz.getMethod("decode", String.class);  
        mainMethod.setAccessible(true);  
         Object retObj=mainMethod.invoke(null, input);  
         return (byte[])retObj;  
    }  
}